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In this paper, ammonia quantitative analysis based on miniaturized Al ionization gas sensor and non-linear bistable dynamic model was proposed. Al plate anodic gas-ionization sensor was used to obtain the current-voltage (I-V) data. Measurement data was processed by non-linear bistable dynamics model. Results showed that the proposed method quantitatively determined ammonia concentrations.
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http://dx.doi.org/10.1080/21655979.2015.1022305 | DOI Listing |
Phys Chem Chem Phys
August 2025
LENS - European Laboratory for Non-linear Spectroscopy, via N. Carrara 1, 50019 Sesto Fiorentino (FI), Italy.
Hydrazones are among the most promising newly developed photochromic molecules, often exhibiting very high isomerization quantum yields, long and tunable half-lives and excellent photostability. It has recently been demonstrated that substitutions on the hydrazone core with electron donating (EDG) or withdrawing (EWG) groups on either the rotor or stator moiety can greatly influence their photoswitching properties, in some cases conferring new and interesting properties onto them, such as emission toggling and two-photon activity. Here, we analyze the photodynamic behavior of three representative substituted hydrazones in depth, using ultrafast visible and infrared transient absorption spectroscopies, and perform density functional theory calculations to interpret their steady-state spectra.
View Article and Find Full Text PDFMath Biosci
July 2025
Mathematics Department, University of British Columbia, 1984 Mathematics Road, Vancouver, V6T 1Z2, British Columbia, Canada; Department of Mathematics and Applied Mathematics, University of Pretoria, Pretoria, 0132, South Africa; Department of Mathematics and Applied Mathematics, University of Johan
Real-world mathematical models often manifest as systems of non-linear differential equations, which presents challenges in obtaining closed-form analytical solutions. In this paper, we study the diffusion-driven instability of an activator-inhibitor-type reaction-diffusion (RD) system modeling the GEF-Rho-Myosin signaling pathway linked to cellular contractility. The mathematical model we study is formulated from first principles using experimental observations.
View Article and Find Full Text PDFChaos
February 2025
School of Economic and Management Science, Weifang University of Science and Technology, Shouguang 262700, People's Republic of China.
This study proposes an innovative hypergraph model to explore the effects of higher-order interactions on the evolution of cooperative behavior in a hyperbolic scale-free network. By adjusting the heterogeneity coefficient and clustering coefficient of the hyperbolic scale-free network, four distinct network structures with notable differences can be obtained. We then map pairwise and three-way interactions to 2-hyperedges and 3-hyperedges, constructing a hypergraph model with higher-order interactions.
View Article and Find Full Text PDFTheor Popul Biol
December 2024
Department of Mathematics, Simon Fraser University, 8888 University Drive, Burnaby, V5A 1S6, British Columbia, Canada.
Tree-killing bark beetle infestations are a cause of massive coniferous forest mortality impacting forest ecosystems and the ecosystem services they provide. Models predicting bark beetle outbreaks are crucial for forest management and conservation, necessitating studies of the effect of epidemiological traits on the probability and severity of outbreaks. Due to the aggregation behaviour of beetles and host tree defence, this epidemiological interaction is highly non-linear and outbreak behaviour remains poorly understood, motivating questions about when an outbreak can occur, what determines outbreak severity, and how aggregation behaviour modulates these quantities.
View Article and Find Full Text PDFChaos
September 2024
Potsdam Institute for Climate Impact Research, Telegrafenberg A31, 14473 Potsdam, Germany.